Παραπομπή APA

Gerhartz, W. (1986). Ullamann's Encyclopedia of Industrial Chemistry (5th ed.). VCH.

Παραπομπή Chicago Style

Gerhartz, Wolfgang. Ullamann's Encyclopedia of Industrial Chemistry. 5th ed. New York: VCH, 1986.

Παραπομπή MLA

Gerhartz, Wolfgang. Ullamann's Encyclopedia of Industrial Chemistry. 5th ed. VCH, 1986.